feat: 信息架构重组 + 变更追踪 + 图片预览增强

- 信息架构重组: 周报精简为拜访+纪要两个Tab，工作计划/商机/要客独立为侧边栏「工作」分组下的独立页面
- 侧边栏分组: 汇总/工作/管理三层分组，仪表盘四卡可点击跳转
- 变更追踪(edit_log): 5张表新增JSONB edit_log列，POST创建/PUT diff自动记录，编辑弹窗变更时间轴，表格🕐编辑标记
- 图片预览增强: ImagePreview统一组件，支持适应页面/缩放/拖拽平移/滚轮缩放/键盘快捷键
- 修复客户导入500错误(errors变量未初始化)
- 移除工作计划/商机/要客页面冗余编辑按钮

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/router/index.ts

@@ -38,6 +38,9 @@ const router = createRouter({
       children: [
         { path: '', name: 'Dashboard', component: () => import('@/views/desktop/Dashboard.vue') },
         { path: 'weekly-report', name: 'WeeklyReport', component: () => import('@/views/desktop/WeeklyReport.vue') },
+        { path: 'work-plans', name: 'WorkPlans', component: () => import('@/views/desktop/WorkPlans.vue') },
+        { path: 'mini-business', name: 'MiniBusiness', component: () => import('@/views/desktop/MiniBusiness.vue') },
+        { path: 'key-visits', name: 'KeyVisits', component: () => import('@/views/desktop/KeyVisits.vue') },
         { path: 'workspace', name: 'ManagerWorkspace', component: () => import('@/views/desktop/ManagerWorkspace.vue') },
         { path: 'customers', name: 'CustomerManage', component: () => import('@/views/desktop/CustomerManage.vue') },
         { path: 'users', name: 'UserManage', component: () => import('@/views/desktop/UserManage.vue') },